Hello everyone, I'm looking at getting a new set of tires for my 1980 CM400t, but after doing some internet searching and some searching on this forum I still have a couple questions. My main question is in regards to tubed vs. tubeless on the star shaped rims. I saw on some other forums that some have "tubeless tire applicable" stamped on the rim, but mine do not. Other people said that any of the star rims after 1979 can take tubeless. I just wanted to get some more input on this as the tires that came on my bike when I bought it are a tubeless one the rear and a tubed on the front. When I first got the bike the rear tire would only sometimes hold air and took it to a shop and they pulled a torn tube out, threw a valve stem in and put it back on without a tube. I've been riding it that way for the last two years (I don't ride super often so less than 2500 miles since I've had it.) and I have noticed that every 3 weeks or so the rear loses about 5-6psi. So my main question is whether or not to go tubeless as I think I would prefer that if possible, and then also was wondering about the 120/90 vs 120/80 vs 130/90 for the rear tire. The current one is 120/80.